Re: PostgreSQL 8.4 performance tuning questions

[Steve Crawford <scrawford(at)pinpointresearch(dot)com>]

Kevin Grittner wrote:
> Steve Crawford <scrawford(at)pinpointresearch(dot)com> wrote: 
>  
>   
> > benchmarks I've seen suggest that with 8 cores you may even see an
> > almost 8x restore speedup
> >     
>  
> I'm curious what sort of data in what environment showed that ratio.
>  
>   
Was going on memory from a presentation I watched. Reports on the web 
have shown anything from a 3x increase using 8 cores to other 
non-detailed reports of "up to" 8x improvement. If you have one big 
table, don't expect much if any improvement. If you have lots of smaller 
tables/indexes then parallel restore will probably benefit you. This is 
all based on the not-atypical assumption that your restore will be CPU 
bound. I don't think parallel restore will be much use beyond the point 
you hit IO limits.

Cheers,
Steve